- #1
kathrynag
- 598
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I am doing a problem with calculating orbits.
The orbit can be expressed in polar coordinates as r=p/(1-ecos(theta)) where r and theta are the distance and angle of the satellite from the center of the earth, p is a paremter where p=1200 km, and e is a parameter representing eccentricity.
I'm supposed to write a program to calculate the distance of the satellite from the Earth as a function of theta if the satellite has an eccentrity of 0, .25, .5, .75, and 1.
Write the program to input values of e and theta. Here is what I have done:
program calculating_orbits
implicit none
real :: r !distance of the satellite from the center of the earth
real :: theta !angle of the satellite from the center of the earth
real, parameter :: p=1200 !parameter specifying the size of the orbit
real :: e !parameter specifying the eccentricity of the orbit
write (*,*) 'This program accepts inputs of theta and e and outputs the
+ value of r=p/(1-e*cos(theta)).'
write (*,*) 'This program will run until a number not in the domain
+ is inputted.'
do
write (*,*) 'Please input a real number.'
read (*,*) e
read (*,*) theta
Now I get stuck. Any hints?
The orbit can be expressed in polar coordinates as r=p/(1-ecos(theta)) where r and theta are the distance and angle of the satellite from the center of the earth, p is a paremter where p=1200 km, and e is a parameter representing eccentricity.
I'm supposed to write a program to calculate the distance of the satellite from the Earth as a function of theta if the satellite has an eccentrity of 0, .25, .5, .75, and 1.
Write the program to input values of e and theta. Here is what I have done:
program calculating_orbits
implicit none
real :: r !distance of the satellite from the center of the earth
real :: theta !angle of the satellite from the center of the earth
real, parameter :: p=1200 !parameter specifying the size of the orbit
real :: e !parameter specifying the eccentricity of the orbit
write (*,*) 'This program accepts inputs of theta and e and outputs the
+ value of r=p/(1-e*cos(theta)).'
write (*,*) 'This program will run until a number not in the domain
+ is inputted.'
do
write (*,*) 'Please input a real number.'
read (*,*) e
read (*,*) theta
Now I get stuck. Any hints?